What system definition to use?

Gigabyte Z370, GTX 1060 & i5 8600K.

I was using iMac 14.2 on High Sierra but want to jump to Catalina. I never really grasped system definitions so i'm stuck here, can't find a lot of information and the much loved vanilla guide is useless here.

What should I use?

submitted by /u/Qandyl
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